Ballenxj,
Go to rv forums and look at truck camper sections, the people posting there will give you solid info on what their trucks carry, modifications needed etc. Bob (host) has given you straightforward reasons, and you'll find that many TC owners with any plumbing prefer one ton duallies over SRW (single rear wheel) trucks. It's the additional stability the duallies give that is so important, not too mention carrying the weight. Those big campers are so tall they lean on curves or when hitting crosswinds and really can give an inexperienced driver concern
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There are TC's that crank up and thus have a lowered profile than fully hard sided nits, however they are not 4 season rigs due to the canvas in the crank up sections. They are half ton carryable though.
Trucks have gone through quite an evolution in payload ever since the 40's and 50's when the terms 1/4 ton, 1/2 ton, 3/4 ton and 1 ton were appropriate descriptions of payload. All this started to change in the 80's and in the mid 2000's things really took off. Today Ford makes a "half ton" F150 that has over 3,000 lbs of payload. :huh: My 1977 GMC 1 ton didn't have a 3,000 lb payload!
From "auto.howstuffworks.com":
"Once you've finally splurged to buy that boat you've always wanted, it may strike you that it's not so smart to lug it around with the old family sedan. Maybe it's time to upgrade to a truck. The question is, "What kind?" Soon after you begin your search, you'll realize that shopping for the right truck can get confusing. When it comes to heavy duty towing and hauling, it's easy to get lost in the sea of terms and safety requirements. The real meaning of "half-ton" pickup, for instance, eludes some automotive folks, let alone first-time truck buyers.
A ton is 2000 pounds (907.19 kg), so does it follow that a half-ton truck weighs 1000 pounds (453.5 kg)? Actually, the name doesn't refer to the weight of the truck. In fact, half-ton pickups weigh much more than that. The weight of a truck without cargo or passengers is called the curb weight. For example, many 2007 half-ton pickups have curb weights between 9000 (4082.3 kg) and 11000 (4989.5 kg) pounds [source: Edmunds].
The "half-ton" description loosely refers to the truck's payload capacity. This means that the truck can carry up to 1000 pounds (453.5 kg) of cargo and passengers in the cab and bed. But wait a minute: If you take a look at the stats on modern half-ton pickups, you'll notice that their payload capacities exceed 1000 pounds (453.5 kg). Although early half-ton pickups could carry max loads of 1000 pounds (453.5 kg), since at least the 1960s, new and improved half-ton pickups have been able to safely carry more, surpassing their namesakes [source: Autotropolis].
But old habits die hard, and the name "half-ton" has stuck around to this day. It's still helpful as a general classification term, differentiating the group from the larger, heavy-duty three-quarter-ton pickups and one-ton pickups (also obsolete terms). A better way to find out the maximum payload capacity is to check the individual truck's specs online or in the owner's manual to see what the manufacturer recommends.
So, don't skip over half-tons because you think you need more capacity -- this name contradicts their real hauling power. Consumer Reports actually warns against buying a truck with more hauling capacity than you need because its higher-capacity suspension will make for a more uncomfortable ride [source: Consumer Reports]. It's also important to note that payload capacity isn't the same thing as towing capacity, which you'll need to consider if you plan to haul a boat or trailer."
End of quote
Bob is correct on TC weights. They are heavy! You also have to remember that is the "dry" weight, without options, batteries, solar, fluids and your personal cargo. All that can push you several hundred to a thousand pounds higher. Same with any trailer or rv.
Lest you think you can blindly accept the manufacturers payload numbers, read this excerpt:
Title: GM changes pickup payload formula to match competitors after complaints
Written Aug 8, 2014 on Yahoo Autos site
"Last week, we told you about a brouhaha among Detroit's pickup builders over the practice used by General Motors and Ford to boost payload ratings by shedding some basic parts. Today, General Motors announced it would no longer use that trick — a move that will make for easier comparisons, but lower payload figures for all of its pickups.
While maximum payload statistics are just one data point in a bushel of numbers truck buyers consider, they're one of the key marketing points dealers use in the fierce battle among Chevy Silverado and GMC Sierra, Ford's F-Series line, Chrysler's Ram division and the light-duty pickups of Nissan and Toyota. Only Ford and GM used the practice of setting a published payload figure by "minimum" curb weight — a number that raises the payload figure by deleting items like spare tires or the back bumper.
Ford and GM have defended the practice, saying their customers could order trucks without those features and that they were transparent about the process. While Ford uses the practice only for heavy-duty pickups, GM had applied it to both heavy and light-duty trucks for 2015. Today, GM said it would stop doing so for all 2015 pickups, both light and heavy-duty — and will apply the standard to the upcoming Chevy Colorado and GMC Canyon mid-size pickups as well.
"This will make our curb weight and payload specs more consistent with those of most other truck makers, making it easier for customers to compare vehicles," said GM spokesman Tom Wilkinson."
End of quote
So to make it easier, you need to look on the door sticker of the actual truck and find the "payload" capacity listed. Most stickers have this. Otherwise you need to get the vehicle weighed and subtract that from the truck's GVWR (gross vehicle weight rating) to see how much "payload" you actually have. Remember that the addition of helper springs or air bags doesn't really increase your real payload, it just keeps the truck from sagging. It doesn't increase the strength of the axles, brakes, what wheel bearings or rims can hold or even what the frame is designed for.
Try to overbuy the truck as you often put more things in it or eventually upsize your TC. You don't need a one ton dually to have an 8' lite TC, but it's a rare half ton that can properly take a 9 footer with water tanks behind the rear axle. Center of gravity also has to figure into your calculations, don't buy a short bed truck and put a long bed camper on it...
Confusing? Yes but we can help you. Oh, do watch your height, there are low clearance bridges out there...
Picture of a low profile TC:
Dusty